---
title: Info String Keys
framework: audiotoolbox
role: collectionGroup
role_heading: API Collection
path: audiotoolbox/info-string-keys
---

# Info String Keys

Key values of properties to get and set using Audio File Services functions and provide a common way to get the same information out of several different kinds of files.

## Topics

### Constants

- [kAFInfoDictionary_Artist](audiotoolbox/kafinfodictionary_artist.md)
- [kAFInfoDictionary_Album](audiotoolbox/kafinfodictionary_album.md)
- [kAFInfoDictionary_Tempo](audiotoolbox/kafinfodictionary_tempo.md)
- [kAFInfoDictionary_KeySignature](audiotoolbox/kafinfodictionary_keysignature.md)
- [kAFInfoDictionary_TimeSignature](audiotoolbox/kafinfodictionary_timesignature.md)
- [kAFInfoDictionary_TrackNumber](audiotoolbox/kafinfodictionary_tracknumber.md)
- [kAFInfoDictionary_Year](audiotoolbox/kafinfodictionary_year.md)
- [kAFInfoDictionary_Composer](audiotoolbox/kafinfodictionary_composer.md)
- [kAFInfoDictionary_Lyricist](audiotoolbox/kafinfodictionary_lyricist.md)
- [kAFInfoDictionary_Genre](audiotoolbox/kafinfodictionary_genre.md)
- [kAFInfoDictionary_Title](audiotoolbox/kafinfodictionary_title.md)
- [kAFInfoDictionary_RecordedDate](audiotoolbox/kafinfodictionary_recordeddate.md)
- [kAFInfoDictionary_Comments](audiotoolbox/kafinfodictionary_comments.md)
- [kAFInfoDictionary_Copyright](audiotoolbox/kafinfodictionary_copyright.md)
- [kAFInfoDictionary_SourceEncoder](audiotoolbox/kafinfodictionary_sourceencoder.md)
- [kAFInfoDictionary_EncodingApplication](audiotoolbox/kafinfodictionary_encodingapplication.md)
- [kAFInfoDictionary_NominalBitRate](audiotoolbox/kafinfodictionary_nominalbitrate.md)
- [kAFInfoDictionary_ChannelLayout](audiotoolbox/kafinfodictionary_channellayout.md)
- [kAFInfoDictionary_ApproximateDurationInSeconds](audiotoolbox/kafinfodictionary_approximatedurationinseconds.md)
- [kAFInfoDictionary_SourceBitDepth](audiotoolbox/kafinfodictionary_sourcebitdepth.md)
- [kAFInfoDictionary_ISRC](audiotoolbox/kafinfodictionary_isrc.md)
- [kAFInfoDictionary_SubTitle](audiotoolbox/kafinfodictionary_subtitle.md)

## See Also

### Constants

- [AudioFileTypeID](audiotoolbox/audiofiletypeid.md)
- [Audio File Creation Flags](audiotoolbox/audio_file_creation_flags.md)
- [AudioFilePermissions](audiotoolbox/audiofilepermissions.md)
- [Audio File Loop Direction Constants](audiotoolbox/1576494-audio-file-loop-direction-consta.md)
- [Audio File Marker Types](audiotoolbox/1576492-audio-file-marker-types.md)
- [AudioFileRegionFlags](audiotoolbox/audiofileregionflags.md)
- [Audio File Packet Translation Flags](audiotoolbox/audio_file_packet_translation_flags.md)
- [Audio File Properties](audiotoolbox/1576499-audio-file-properties.md)
- [Audio File Global Info Properties](audiotoolbox/1576495-audio-file-global-info-propertie.md)